Add all the video-related fields to Status

Previously video.status only contained privacy-related status.
After this commit, video.status also contain all the other information
related to the status of a video that YouTube makes available:

- upload status
- failure reason
- rejection reason
- scheduled time
- license
- embeddable
- public stats viewable
Merge pull request #28 from Fullscreen/add-status-fields

Add all the video-related fields to Status